Not too far into the mission, after Chief tries to kill the Weapon, when we have to climb the floating blocks while avoiding the incinerating beam, we come to a room were we have to insert a power seed to activate the gravity lift. I found that there are 2 power seeds in this room, yet apparently only one station (part of story objective) to insert a power seed.
I am not sure if this extra power seed does anything at all. I’ve tired going both up and down the gravlift and the power seed resets, so whatever it does, if ever, has to be on this particular level. However, I’ve searched the room, and haven’t found any other receptacle ports.
Was this extra seed placed for symmetry? So no matter which direction the player went. they could find a power seed? The only objection I have with this, is that throughout the entire campaign each power seed fulfills a very specific role and there are no extras; it’s 1 seed per 1 port. That alone makes me wonder if this is part of an Easter egg I just can’t seem to figure out.